Vulnerabilities

CVSS

8.2 High

Vector

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Risk score

65.6

Published

2026-07-14

Status

Published

A security issue exists within CompactLogix® 5380, ControlLogix® 5580, and EN4 communication modules related to CIP Security certificate revocation handling. The security issue stems from the controller failing to properly reject certificates signed by an intermediate certificate that has been revoked via a Certificate Revocation List (CRL). This could allow a network-based attacker to establish a connection using a certificate that should be untrusted, potentially bypassing CIP Security protections.

Weaknesses

CWE-299

Coverage 1

vulnerability

Rockwell Automation CompactLogix 5380 ControlLogix 5580 / 1756-EN4TR Communications Module

A vulnerability exists in Rockwell Automation's CompactLogix, ControlLogix, and GuardLogix communication modules (specifically the 1756-EN4TR module) due to improper certificate revocation handling. An attacker could exp…

CISA Advisories · Jul 30, 2026 High

CVE-2026-9636certificate revocationcip securityindustrial control systems

All articles mentioning it

Advisories and references

• rockwellautomation.com/en-us/trust-center/security-advisories/adviso...